ON Semiconductor MC34262, MC33262 Technical data

MC34262, MC33262

Power Factor Controllers

The MC34262/MC33262 are active power factor controllers specifically designed for use as a preconverter in electronic ballast and in off−line power converter applications. These integrated circuits feature an internal startup timer for stand−alone applications, a one quadrant multiplier for near unity power factor, zero current detector to ensure critical conduction operation, transconductance error amplifier, quickstart circuit for enhanced startup, trimmed internal bandgap reference, current sensing comparator, and a totem pole output ideally suited for driving a power MOSFET.

Also included are protective features consisting of an overvoltage comparator to eliminate runaway output voltage due to load removal, input undervoltage lockout with hysteresis, cycle−by−cycle current limiting, multiplier output clamp that limits maximum peak switch current, an RS latch for single pulse metering, and a drive output high state clamp for MOSFET gate protection. These devices are available in dual−in−line and surface mount plastic packages.

Features

• Overvoltage Comparator Eliminates Runaway Output Voltage

• Internal Startup Timer

• One Quadrant Multiplier

• Zero Current Detector

• Trimmed 2% Internal Bandgap Reference

• Totem Pole Output with High State Clamp

• Undervoltage Lockout with 6.0 V of Hysteresis

• Low Startup and Operating Current

• Supersedes Functionality of SG3561 and TDA4817

• Pb−Free Packages are Available

Zero Current Detector

2.5V

Reference

Undervoltage

Lockout

Zero Current Detect Input

http://onsemi.com

POWER FACTOR

CONTROLLERS

MARKING

DIAGRAMS

PDIP−8

P SUFFIX

CASE 626

SOIC−8 D SUFFIX CASE 751

x = 3 or 4 A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work W eek

PIN CONNECTIONS

MC3x262P

AWL

YYWW

3x262 ALYW

Multiplier,

Latch, PWM, Timer,

Logic

Multiplier

Input

GND

Multiplier

Compensation

Figure 1. Simplified Block Diagram

 Semiconductor Components Industries, LLC, 2004

July, 2004 − Rev. 7

Error Amp

Overvoltage Comparator

1.08 V

Quickstart

Voltage Feedback

Drive Output

Current Sense Input

ref

Voltage Feedback

Input

1 Publication Order Number:

Compensation

Multiplier Input Current Sense

ORDERING INFORMATION

See detailed ordering and shipping information in the package dimensions section on page 17 of this data sheet.

Input

(Top View)

Drive Output

Zero Current

Detect Input

MC34262/D

MC34262, MC33262

MAXIMUM RATINGS

Rating Symbol Value Unit

Total Power Supply and Zener Current (ICC + IZ) 30 mA Output Current, Source or Sink (Note 1) I Current Sense, Multiplier, and Voltage Feedback Inputs V Zero Current Detect Input

High State Forward Current Low State Reverse Current

Power Dissipation and Thermal Characteristics

P Suffix, Plastic Package, Case 626

Maximum Power Dissipation @ TA = 70°C Thermal Resistance, Junction−to−Air



D Suffix, Plastic Package, Case 751

Maximum Power Dissipation @ TA = 70°C

Thermal Resistance, Junction−to−Air Operating Junction Temperature T Operating Ambient Temperature (Note 3)



JA J

MC34262 MC33262

Storage Temperature T

stg

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected.

500 mA

−1.0 to +10 V mA

−10

800 100

450 178

°C/W

+150 °C

°C

0 to + 85

− 40 to +105

− 65 to +150 °C

ELECTRICAL CHARACTERISTICS (V

= 12 V (Note 2), for typical values TA = 25°C, for min/max values T

ambient temperature range that applies (Note 3), unless otherwise noted.)

Characteristic Symbol Min Typ Max Unit

ERROR AMPLIFIER

Voltage Feedback Input Threshold

TA = 25°C TA = T

low

to T

(VCC = 12 V to 28 V)

high

Line Regulation (VCC = 12 V to 28 V , TA = 25°C) Reg Input Bias Current (VFB = 0 V) I Transconductance (TA = 25°C) g Output Current

Source (VFB = 2.3 V) Sink (VFB = 2.7 V)

Output Voltage Swing

High State (VFB = 2.3 V) Low State (VFB = 2.7 V)

OVERVOLTAGE COMPARA TOR

Voltage Feedback Input Threshold V

MULTIPLIER

Input Bias Current, Pin 3 (V

= 0 V) I

Input Threshold, Pin 2 V

1. Maximum package power dissipation limits must be observed.

2. Adjust VCC above the startup threshold before setting to 12 V .

3. T

=0°C for MC34262 T

low

= −40°C for MC33262 = +105°C for MC33262.

= +85°C for MC34262

high

OH(ea)

OL(ea)

FB(OV)

th(M)

is the operating

line

2.465

2.44

− 1.0 10 mV

2.5

−

2.535

2.54

− − 0.1 − 0.5 A

80 100 130 mho

A

−

10 10

−

− V

5.8

−

1.065 V

6.4

1.7

1.08 V

−

2.4

1.095 V

− − 0.1 − 0.5 A

1.05 V

OL(EA)

1.2 V

OL(EA)

− V

http://onsemi.com

MC34262, MC33262

ELECTRICAL CHARACTERISTICS (continued) (V

= 12 V (Note 5), for typical values TA = 25°C, for min/max values T

operating ambient temperature range that applies (Note 6), unless otherwise noted.)

Characteristic Symbol Min Typ Max Unit

MULTIPLIER

Dynamic Input Voltage Range

Multiplier Input (Pin 3) Compensation (Pin 2)

Multiplier Gain (V

Pin 3

= 0.5 V , V

Pin 2

= V

+ 1.0 V) (Note 7) K 0.43 0.65 0.87 1/V

th(M)

V V

Pin 3 Pin 2

ZERO CURRENT DETECTOR

Input Threshold Voltage (Vin Increasing) V Hysteresis (Vin Decreasing) V

Input Clamp Voltage

High State (I Low State (I

= + 3.0 mA)

DET

= − 3.0 mA)

DET

CURRENT SENSE COMPARATOR

Input Bias Current (V Input Offset V oltage (V Maximum Current Sense Input Threshold (Note 8) V Delay to Output t

= 0 V) I

Pin 4

Pin 2

= 1.1 V , V

= 0 V) V

Pin 3

th(max)

PHL(in/out)

DRIVE OUTPUT

Output Voltage (VCC = 12 V)

Low State (I

High State (I

Output Voltage (VCC = 30 V) High State (I

Output Voltage Rise T ime (CL = 1.0 nF) t Output Voltage Fall T ime (CL = 1.0 nF) t Output Voltage with UVLO Activated

(VCC = 7.0 V , I

= 20 mA)

Sink

= 200 mA)

Sink

= 20 mA)

Source

= 200 mA)

Source

= 20 mA, CL = 15 pF)

Source

= 1.0 mA)

Sink

O(max)

O(UVLO)

RESTART TIMER

Restart Time Delay t

DLY

UNDERVOLTAGE LOCKOUT

Startup Threshold (VCC Increasing) V Minimum Operating Voltage After T urn−On (VCC Decreasing) V Hysteresis V

th(on)

Shutdown

TOTAL DEVICE

Power Supply Current

Startup (VCC = 7.0 V) Operating Dynamic Operating (50 kHz, CL = 1.0 nF)

Power Supply Zener Voltage (ICC = 25 mA) V

4. Maximum package power dissipation limits must be observed.

5. Adjust VCC above the startup threshold before setting to 12 V .

6. T

=0°C for MC34262 T

low

= −40°C for MC33262 = +105°C for MC33262.

7. K 

Pin 4 Threshold

Pin 3(VPin2

 V

th(M )

)

8. This parameter is measured with VFB = 0 V , and V

= +85°C for MC34262

high

= 3.0 V .

Pin 3

th(M)

0 to 2.5

th(M)

+ 1.0)

th(M)

0 to 3.5

th(M)

+ 1.5)

−

1.33 1.6 1.87 V 100 200 300 mV

6.1

0.3

6.7

0.7

−

1.0

− − 0.15 −1.0 A

− 9.0 25 mV

1.3 1.5 1.8 V

− 200 400 ns

−

9.8

7.8

0.3

2.4

10.3

8.4

0.8

3.3

−

14 16 18

− 50 120 ns

− 0.1 0.5 V

200 620 − s

11.5 13 14.5 V

7.0 8.0 9.0 V

3.8 5.0 6.2 V

−

0.25

6.5

9.0

0.4 12 20

30 36 − V

is the

http://onsemi.com

MC34262, MC33262

0 V/DIV

1.6 0.08 VCC = 12 V

1.4

= 25°C

1.2

= 3.75 V

1.0

0.8

0.6

Pin 2

= 3.5 V

Pin 2

= 3.25 V

Pin 2

= 3.0 V

Pin 2

= 2.75 V

= 2.5 V

= 2.25 V

0.4

0.2

, CURRENT SENSE PIN 4 THRESHOLD (V)

1.4−0.2 3.80.6 2.2 3.0

Pin 2

= 2.0 V

VM, MULTIPLIER PIN 3 INPUT VOLTAGE (V)

Figure 2. Current Sense Input Threshold

versus Multiplier Input

4.0

VCC = 12 V Pins 1 to 2

−4.0

−8.0

= 3.75 V

Pin 2

= 3.5 V

Pin 2

0.07 V

= 3.25 V

Pin 2

0.06

= 3.0 V

Pin 2

= 2.75 V

Pin 2

0.05

0.04

0.03

0.02

0.01

, CURRENT SENSE PIN 4 THRESHOLD (V)

−0.12

−0.06 0.06 0.12 0.18 0.240 VM, MULTIPLIER PIN 3 INPUT VOLTAGE (V)

Figure 3. Current Sense Input Threshold

versus Multiplier Input, Expanded View

)

110

109

108

VCC = 12 V T

= 25°C

= 2.5 V

Pin 2

= 2.25 V

Pin 2

= 2.0 V

Pin 2

VCC = 12 V

−12

−16

, VOLTAGE FEEDBACK THRESHOLD CHANGE (mV) V

−55

V

−25 0 25 50 75 100 125

, AMBIENT TEMPERATURE (°C)

Figure 4. Voltage Feedback Input Threshold

Change versus Temperature

120

100

, TRANSCONDUCTANCE (mho)

Phase

VCC = 12 V VO = 2.5 V to 3.5 V

Transconductance

RL = 100 k to 3.0 V CL = 2.0 pF

= 25°C

3.0 k 10 k 30 k 100 k 300 k 1.0 M 3.0 M f, FREQUENCY (Hz)

107

, OVERVOLTAGE INPUT THRESHOLD (%V

106

FB(OV)

−55

V

Figure 5. Overvoltage Comparator Input

4.00 V

3.25 V

120

150

2.50 V

, EXCESS PHASE (DEGREES)

180

−25 0 25 50 75 100

, AMBIENT TEMPERATURE (°C)

Threshold versus Temperature

VCC = 12 V RL = 100 k CL = 2.0 pF T

= 25°C

5.0 s/DIV

125

Figure 6. Error Amp Transconductance and

Phase versus Frequency

http://onsemi.com

Figure 7. Error Amp Transient Response

MC34262, MC33262

5.0 V/DIV100 mA/DIV

1.80 VCC = 12 V

1.76

1.72

Voltage

Current

1.68

, QUICKSTART CHARGE VOLTAGE (V)

chg

1.64

−55 −25 0 25 50 75 100 125

, AMBIENT TEMPERATURE (°C)

Figure 8. Quickstart Charge Current

versus Temperature

1.7

Upper Threshold

(Vin, Increasing)

1.6

VCC = 12 V

900

800

700

600

500

800

VCC = 12 V

700

600

500

, RESTART TIME DELAY (s)

DLY

, QUICKSTART CHARGE CURRENT (A)

chg

400

−55

−25 0 25 50 75 100 125 T

, AMBIENT TEMPERATURE (°C)

Figure 9. Restart Timer Delay

versus Temperature

−2.0

−4.0

Source Saturation

(Load to Ground)

VCC = 12 V 80 s Pulsed Load 120 Hz Rate

, THRESHOLD VOLTAGE (V)

90%

10%

1.5

1.4 Lower Threshold

(Vin, Decreasing)

1.3

−55

−25 0 25 50 75 100 125 T

, AMBIENT TEMPERATURE (°C)

Figure 10. Zero Current Detector Input

Threshold Voltage versus Temperature

VCC = 12 V CL = 1.0 nF

= 25°C

−6.0

4.0 Sink Saturation

2.0

, OUTPUT SATURATION VOLTAGE (V)

sat

0 80 160 240 32

(Load to VCC)

GND

IO, OUTPUT LOAD CURRENT (mA)

Figure 11. Output Saturation Voltage

versus Load Current

, OUTPUT VOLTAGE

VCC = 12 V

CL = 15 pF

= 25°C

100 ns/DIV

Figure 12. Drive Output Waveform Figure 13. Drive Output Cross Conduction

http://onsemi.com

, SUPPLY CURRENT V

MC34262, MC33262

8.0

VFB = 0 V

, SUPPLY CURRENT (mA)

4.0

0 10203040

VCC, SUPPLY VOLTAGE (V)

Current Sense = 0 V Multiplier = 0 V CL = 1.0 nF f = 50 kHz T

= 25°C

Figure 14. Supply Current

versus Supply Voltage

FUNCTIONAL DESCRIPTION

Introduction

With the goal of exceeding the requirements of legislation on line−current harmonic content, there is an ever increasing demand for an economical method of obtaining a unity power factor. This data sheet describes a monolithic control IC that was specifically designed for power factor control with minimal external components. It offers the designer a simple, cost−effective solution to obtain the benefits of active power factor correction.

Most electronic ballasts and switching power supplies use a bridge rectifier and a bulk storage capacitor to derive raw dc voltage from the utility ac line, Figure 15.

, SUPPLY VOLTAGE (V)

9.0

8.0

7.0

−55 −25 0 25 50 75 100 125

Startup Threshold

(VCC Increasing)

Minimum Operating Threshold

(VCC Decreasing)

, AMBIENT TEMPERATURE (°C)

Figure 15. Undervoltage Lockout Thresholds

versus Temperature

frequency switching converter for the power processing, with the boost converter being the most popular topology, Figure 17. Since active input circuits operate at a frequency much higher than that of the ac line, they are smaller, lighter in weight, and more efficient than a passive circuit that yields similar results. With proper control of the preconverter, almost any complex load can be made to appear resistive to the ac line, thus significantly reducing the harmonic current content.

Rectifiers Converter

Line

Bulk Storage Capacitor

Load

Figure 16. Uncorrected Power Factor Circuit

This simple rectifying circuit draws power from the line when the instantaneous ac voltage exceeds the capacitor voltage. This occurs near the line voltage peak and results in a high charge current spike, Figure 16. Since power is only taken near the line voltage peaks, the resulting spikes of current are extremely nonsinusoidal with a high content of harmonics. This results in a poor power factor condition where the apparent input power is much higher than the real power. Power factor ratios of 0.5 to 0.7 are common.

Power factor correction can be achieved with the use of either a passive or an active input circuit. Passive circuits usually contain a combination of large capacitors, inductors, and rectifiers that operate at the ac line frequency. Active circuits incorporate some form of a high

Rectified

AC Line

Voltage

AC Line

Current

Line Sag

Figure 17. Uncorrected Power Factor

Input Waveforms

The MC34262, MC33262 are high performance, critical conduction, current−mode power factor controllers specifically designed for use in off−line active preconverters. These devices provide the necessary features required to significantly enhance poor power factor loads by keeping the ac line current sinusoidal and in phase with the line voltage.

http://onsemi.com

+ 14 hidden pages